SaunHaus

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The Numbers

"There’s never a situation where you want bad fertility markers, even if you aren’t trying to have kids…. they have a whole bunch of hormonal feedback loops" - Bryan Johnson (Founder of Blueprint and most measured person in history)

The Difference Is Not Small

Total sperm count

40-50% decrease

Up to 50% stronger count protection*

Total motile sperm count

45-55% decrease

Up to 55% stronger motile protection*

Sperm concentration

35-45% decrease

Up to 45% stronger concentration protection*

Sperm DNA fragmentation

15-25% increase

Up to 25% lower DNA-fragmentation risk*

Without Cooling

Total sperm count40-50% decrease

Total motile sperm count45-55% decrease

Sperm concentration35-45% decrease

Sperm DNA fragmentation15-25% increase

With SaunGuard

Total sperm countUp to 50% stronger count protection*

Total motile sperm countUp to 55% stronger motile protection*

Sperm concentrationUp to 45% stronger concentration protection*

Sperm DNA fragmentationUp to 25% lower DNA-fragmentation risk*

*With SaunGuard outcomes are directional positioning statements based on reported heat-exposure risks, not guaranteed medical outcomes.

Source study

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Fertility & Sauna

THE EXPERIMENT

After 100 sauna sessions, Bryan tested his fertility. Without cooling, the results were shocking:

-50%

FERTILITY MARKERS

Wiped out from sauna use

68–72

DAYS TO RECOVER

Once sauna use was ended

“I wondered—am I going to forever be infertile? The answer is no, because if you begin icing now, the body will rebuild.”

— BRYAN JOHNSON

THE SOLUTION

What Bryan uncovered was alarming: sustained heat exposure can rapidly erode male fertility and performance.

Cooling is the defense. SaunGuard™ uses intentional design to deliver discreet cooling exactly where protection is needed most.

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SaunGaurd™ Fertility Protecting Briefs

$29.99 $44.99

SaunGuard briefs are designed with a custom front pocket that holds a reusable ice pack to help reduce excess heat exposure where it matters most. Built for sauna sessions and other high-temperature environments, they provide a simple, targeted way to support comfort and cooling without changing your routine.

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SCIENTIFIC STUDIES

Research on heat and male fertility.

The impact of heat on sperm quality has been well documented in scientific literature. Explore the studies below:

TESTICULAR HEATING

Testicular heating and its possible contributions to male infertility by R Mieusset, L. Bujan

Hypothesis to Explain Subfertile Semen

even small increases in temperature from experimental application of external heat can cause disruption by Advances in Experimental medicine and Biology (AEMB, volume 286)